25 lines
344 B
Go
25 lines
344 B
Go
package ui
|
|
|
|
import (
|
|
"sync/atomic"
|
|
)
|
|
|
|
type Invalidatable struct {
|
|
onInvalidate atomic.Value
|
|
}
|
|
|
|
func (i *Invalidatable) OnInvalidate(f func(d Drawable)) {
|
|
i.onInvalidate.Store(f)
|
|
}
|
|
|
|
func (i *Invalidatable) DoInvalidate(d Drawable) {
|
|
v := i.onInvalidate.Load()
|
|
if v == nil {
|
|
return
|
|
}
|
|
f := v.(func(d Drawable))
|
|
if f != nil {
|
|
f(d)
|
|
}
|
|
}
|